Basic ether containing halogen



Patented F eb.27, 1934 UNITED STATES PATENT OFFICE BASIC ETHER CONTAINING HALOGEN Max Hartmann and Hans Isler, Riehen, near Basel, Switzerland, assignors to the firm of Society of Chemical Industry in Basle, Basel,

Switzerland No Drawing. Original application March 24,

1930, Serial No. 438,638. Divided and plication February 1 27,

this ap- 1932. Serial No.

559,651. In Switzerland April 5, 1929 1 Claim.

pounds have no appreciableantiseptic actionthere are obtained products which are valuable antiseptics.

The new products may be made by causing, advantageously in presence of an acid binding agent, (a) a reactive ester of an amino-alcohol to react with a compound of the aromatic series or of the quinoline series containing halogen and a nuclear hydroxyl group, or with a sub- ;stitution product ofsuch a compound. or (b) an'amino alcohol to react with a polyhalogen compound of the aromatic series or of the quinoline series, or with a substitution product thereof, in such a'manner that at least one halogen atom remains in the product.

The new basic ethers may also be obtained by causing amines to react with compounds of the aromatic or quinoline series containing halogenalkoxy-groups and halogen in the nucleus.

Another method of making the new compounds consists in introducing one or more'halogen atoms into a basic ether of the aromatic series or of the quinolineseries, which is free from halogen, for instance by direct halogenation by means of halogen or an agent yielding halogen, or' by replacing an amino-group in the basic ether by halogen. Yet another method of making the new products consists in converting a basic ether of an aromatic compound containing halogen, by a suitable ringclosure, into the basic ether of a quinoline compound containing halogen, for example by condensation of a halogenated basic ether of an aromatic compound with glycerine.

The new bases yield salts bycombination with one equivalent, or in the case of bases of the quinoline series, also with two equivalents of an acid. By reasonof the fact that these salts are soluble inwater', the new compounds have avery .widessphere of application; forexample, aqueous solutions of the salts formed by combination with one equivalent of an acid are especially suitable, on account of their neutral reaction, for internal application, for instance for injection. In contrast with the new basic ethers the corresponding halogenated phenols of the aromatic series and of the quinoline series, such as chlorothymol, chloro-iodo-oxyquinoline or the like, are practically insoluble in Water.

The new products are applicable for therapeutic purposes.

The following examples illustrate the invention; the parts being by weight:

Example 1 1 part of chloro-thymol, 1.2 parts of chlorethyldiethylamine-hydrochloride and 3 parts'of potassium carbonate are mixed'with acetone and the mixture is heated to boiling whilst stirring; When the reaction is complete the inorganic matter is separated by filtration; the filtrate is distilled to remove acetone and the residue is taken up in benzene and treated several timeswith a dilute solution of caustic soda. The solvent is then'expelled and the product distilled under reduced pressure, whereby there is obtained 1 diethylamino ethoxy 2-isopropyl-4- chloro-5-methylbenzene of boiling point 142-143 C. under a pressure of 3 mm. The product is. afaintly yellow oil; its hydrochloride is a colorless powder, which is easily soluble in water.

The same product may be obtained by causing diethylamine to react with l-bromoethoxy-Z-isopropy1-4-chloro-5-methylbenzene. The 1bromoethoxy-Z-isopropyl-4-chloro 5 methylbenzene, (yellow oil of boiling point 154-l55 C. under a pressure of 6 mm), is prepared from chlorothymol and ethylene-bromide.

Example 2 3 parts of tribromophenol, 3 parts of chloroethyldiethylamine hydrochloride, 1 part of sodium hydroxide and parts of water are heated at 5060 C. for several hours, whilst stirring. The reaction mixture is then allowed to cool andthe. product is extracted by means of benzene. The benzene extract is distilled to remove the solvent and the residue is distilled under reduced pressure. There is thus obtained 2.4.6-tribromo-1-diethylaminoethoxybenzene, a yellow oil boiling at Flo-171 C. under a pressure of 3 mm. Its hydrochloride is a crystalline powder of melting point 163-164 C. and is readily soluble in water.

Example 3 To a solution in glacial acetic acid of 1 part of diethylaminoethoxynaphthalene (a bright yellow oil forming a hydrochloride of melting point 159-161 C. and obtainable from a-naphthol by a process analogous to that described in Example 1) there is added gradually 1.3 part of bromine. There separates an orange crystalline perbromide which is converted by boiling in the presence of a small quantity of acetone into l-diethylaminoethoxy 4 bromonaphthalene hydrobromide of melting point 174-175" C. The free base forms a yellowish oil; its hydrochloride is a colorless crystalline powder which is easily soluble in water and melts at 179-l80 C.

Example 4 To a solution of 1 part of sodium in 200 parts of absolute alcohol are added 4 parts of 5-chloro- 7-iodo-8-hydroxyquinoline and 4 parts of chlorethyldiethylamine-hydrochloride. The whole is heated for some time, separated from inorganic matter by filtration and the filtrate is distilled under reduced pressure to remove alcohol. The residue is taken up in benzene, the benzene solution is extracted several times by means of dilute caustic soda solution and the benzene is finally distilled. There is thus obtained 5-chloro-7-iodo- 8-diethylamino-ethoxy-quinoline, a yellow viscous oil which forms salts by combination with one equivalent or with two equivalents of acid. The salts of both types are in general easily soluble in water, salts of the former type yielding neutral solutions and salts of the latter type yielding solutions having an acid reaction. The mono-hydrochloride forms almost'colorless crystals of melting point l87-188 C., and the dihydrochloride a yellow crystalline powder of melting point 153-154 C.

Example 6 A mixture of 4 parts of 5:6:7-trichloro-hydroxyquinoline, 5 parts of chloroethyldiethylamine-hydrochloride, 10 parts of potassium carbonate and 200 parts of acetone are heated to boiling for several hours, whereupon the reaction mixture is worked up in the manner described in Example 1. There is obtained 5:6:l-trichloro- 8-diethylaminoethoxyquinoline; the product is a practically colorless oil and forms a colorless crystalline dihydrochloride of melting point 134-135 C. r

. Example 7 22 parts of 2:ldichloro-4-methylquinoline are introduced into a solution of 3 parts of sodium in 100 parts of diethylaminoethanol and the whole is heated for some time at 140-145 C. on an oil bath. Sodium chloride is then removed by filtration and the excess of diethylaminoethanol is removed from the filtrate by distillation. There remains a yellow oil consisting of 2-diethylaminoethoxy 4 methyl 7 chloroquinoline. It forms a dihydrochloride of melting point 154- 155 C. and a methanesulfonate melting at 133- 135- 0.; both salts are colorless crystalline powders and are easily soluble in water.

2z'I-dichloro-4-methylquinoline may be made in the following manner: Aceto-acetic-ester is condensed with meta-chloraniline and the metachloro-aceto-acetic-anilide of melting point 103-104 C. thus produced is heated for some time'with concentrated sulfuric acid, whereby ring closure occurs with the elimination of water. and Z-hydroxy 4 methyl 'l chloro-quinoline (melting point 2'71-272 C.) is formed. By heating the latter compound with phosphorus oxychloride it is converted into 2:7-dichloro-4- methylquinoline of melting point 97-98 C.

Example 8 A mixture of 2 parts of l-diethylaminoethoxy- 2 amino-4-chlorobenzene (obtainable as described in Example 4), 1.5 part of arsenic acid, 5 parts of glycerine' and 4 parts of sulfuric acid of 56 B is heated for some time at a temperature of l60-165 C. The reaction mixture is then poured into water; the whole is made alkaline and then extracted by means of benzene. After distilling the extract to remove the benzene the residue is distilled fractionally under reduced pressure, 5-chloro-8-diethylaminoethoxyquinoline distilling at 165-169 C. under a pressure of 0.6 mm. The product is a yellowish oil and forms a hydrochloride constituting a lemon-yellow crystalline powder which is easily soluble in water and melts at 191-193 C.

In a similar manner there may be obtained in accordance with the invention the following compounds:

Melting Salt point l-dicyclohexylamino-othoxy-4-chlo- Hydrochloride l98-1i)9 C.

robenzene.

5 brpmo 8 -diethylamino ethoxy- D ihydrochlol58159 C.

qumollne. ride.

5 chloro 8 dicyclohexyl amino do 239-240 C.

ethoxy-quinoline.

5 chloro 7 bromo 8 diethyl do l42143 O.

aminoethoxy-quinoline.

5:7 dibromo 8 diethylamino do l65166 C.

ethoxy-quinoline.

5 bromo 7 iodo 8 diethylamino -do 142-143" 0.

ethoxy-quinoline.

5:7 di iodo 8 diethylamino ....do 168-169" 0.

ethoxy-quinolme.

4 methyl 7 chloro 8 piperidino do 150l51 C.

ethoxy-quinoline.

In the same way there may further be obtained the corresponding aminopropyloxy, aminobutyloxy-, aminoamyloxyetc. derivatives.

The compounds serving as parent materials for the manufacture of certain of the bases described in the foregoing table may be made in the following manner: 7

5-chloro-'l-bromo-8-hydroxyquinoline (melting point 177-1'l9 C.) by bromination of 5-chloro-8-hydroxyquinoline in glacial acetic acid;

The diethylaminoethoxy-bromonaphthalene of the formula CgH5 6-oH20H2-N C2Hs which product is a yellowish oil forming with hydrochloric acid a salt of melting point 179180 C. soluble in water, said product being useful in therapeutics as an antiseptic.

MAX HARTMANN. HANS ISLER. 

